Island



Patented Aug. 9, |898. C. H. NEWHALL.

E L E V A T 0 R (Application med Dec. v9, 189e.)

(No Model.)

W/ rNEssEs F/JMH nire rares CHARLES II. NEWIIALL, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE-HALF TO JAMES A. MCOOART, OF SAME PLACE.

ELEVATOR.

srncIFIcATIoN forming part of Letters ratent No. 608,789, eaten August 9, 1898. Application filed December 9, 1896.. Serial ITO. 614,997. (No model.)

To @ZZ whom it ma/gommer.-

Be it known that I, CHARLES I-l. NEWHALL, of Providence, in the countyof Providence and State of Rhode Island, have invented cer- 1 tain new and useful Improvements in Elevators; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to the accompanying drawings, and to `the letters of reference marked thereon, which form a part of this specification.- p

This invention relates to that class of elevator safety attachments in which an electric current is used as the medium through which the parts are operated to produce the desired results.

It is fully explained and illustrated in this specification and the accompanying drawings.

Figure lis a` perspective view of the elevator-car, the prime motor for raising and low.- ering the car minus the wire ropes, and the auxiliary motor for controlling the operation ofthe prime motor and the connecting parts between the two motors. Fig. 2 is a sectional view, on an enlarged scale, of the auxiliary motor, taken vertically through the center of the cylinder and supply-pipe. Fig.,3 is an enlarged view of the devices by which the door of the elevatorewell opens and closes the electrical circuit. Fig. 4 is a detail.

The objects of the invention are to provide means whereby, iirst, that the car'shall `be incapable of being started if the door of,y the elevator-well is not closed; second, that if the well-door shall be opened the car will stop wherever it may be at that time; third, if the electric circuit is broken in any place accidentally the car will stop at once if in Inotion and cannot bestarted if at rest.

Theconstruction is as follows:

H is the elevator-car. Y

`B is the prime motor, which may be oper- -ated by steam or hydraulic pressure, and its connections with the car may be made with wire ropes in any of the usual ways.

D is an auxiliary motor to control the operation of the prime motor and is in this casel supposed to be operated by hydraulic pressure.

a is the supplypipe to the prime motor and connects `the same with a steam-boiler. (Not shown.)

c is the supply-pipe for the auxiliary motor and is connected with a water-main hav ing a suitable pressure.

e e are passage-ways connecting the supply-chamber 3" with the ends of the cylinder of motor D.

s is the valve-stem, on which are the two upper and lower passage-valves it" of the motor D, which form a balanced valve in eifect.

A bracket??J extends out from the motor D to support an electromagnet c', and the valvestem s extends` down between the coils of the electromagnet and has an armature 'u attached to it under the electromagnet, and an open spiral spring n is placed on the valvestem s, between valve-case and a collar on the valve-stem, to push the valve-stem down when not -drawn up by the attraction of the magnet on the armature.

d CZ' are wires forming a circuit with a battery or other source of electricity included in it and are connected with the electromagnet c' to charge it. The prime motor B is started and stopped by a lever F, hung on a rockershaft t, heldin standards on the top of the motor, and a cord 7L h connects it from each side of the shaft with the starting-lever g of tlie car I-I. One end of the lever F is extended out and has a chain m, which passes between two pulleys oV o and is connected to the end of the verticalleg of a knee-lever J,

held on a pivot in the lower part of the mo- Ator D, the horizontal arm of the knee-lever being connected to the piston-rod of the motor D, so that when that piston is moved up the knee-lever J will be moved to draw on the chain m and pull the lever F up against the two pulleys o' o', so that it cannot be moved in the car by the lever g to start the car, for the drawing of the lever F, whether it be from above or below, to the pulleys closes the valve in the prime motor B, and at the same time a cord a', that has one end made fast to the end of the lower leg of the lever .I and is carried out over the pulley a" and up over to the shut-ott valve w in the supply-pipe a of the motor B, will be slacked up, so as to let the valve w be shut by the weight on its lever, so that if the devices directly con- IOO nected with the lever F fail to operate the shutting of the valve will stop the motor B by shutting off the supply of steam.

In Fig. 3 is shown an enlarged represent-ation of the devices for opening and closing the circuit by the elevator-Well door 7c. A socket 'n is attached to the frame of the door 7c, and a bolt c is fitted to slide therein. The inner half of this bolt is made smaller and has a spring put on to push the bolt out of the socket. The small part of the bolt is made to slide in a hole in the inner end of the socket, so that when. the door 7o is closed it will push the bolt out at the inner end and press the disk fu, which has one of the circuit-Wires d attached to it, against the plate 2', which has the other circuit- Wire d attached to it, and in this Way close the circuit, and the operation of the parts will be this: When the door 7a is open, the circuit will be broken by the separation of the disk 11"', and the electromagnet will not be charged and the spring a will be free to push down the valves t' t" and allow the Water to enter the lower end of the cylinder of motor D from the supply 8'@ by the passage c and force up the piston and move the lower leg of the lever J so as to draw the lever F, by the chain m, against the pulleys o o', as described above, and hold it there, so it cannot be moved to start the motorv and ear. rlhis same condition of things obtains if the circuit is broken accidentally. The car will stop whereverit may be; but when the door 7c of the elevatorwell is safely closed the circuit will be closed by the pushing in of the bolt c", as described, and the eleetromagnet will be charged and draw up the armature n and valve-stem s, with the valves 7,' t', and open the upper passage c for the water to enter the upper end of the cylinder and force the piston down and moving the knee-lever .I to slacken the chain m and leave the lever F free to be moved, so that car can be started by the lever g.

A circuit-breaker g is placed in the car and included in the circuit d d. It is constructed like the one for the door 7s, (shown in Fig. 3,) excepting that the Wire d instead of being attached to the plate t" is attached to the plate 2"", as shown in Fig. 4, so that when the starting-lever g is moved to a vertical position it will push in the bolt c and break the circuit, which will cause the car to stop, as above described. It will readily be seen that if the ropes 7L 7L should be broken, so there would be no control through them of the lever F, the ear could still be stopped by putting the starting-lever g into a vertical posi tion through the breaking of the circuit at g@ as just described.

This mechanism for stopping the car or preventing it from starting is not intended to interfere in any way or to have any connection with the operation of the devices usually attached to elevator-cars to prevent the car from fallin g when the rope that hoists the car breaks.

Having thus described my improvements, I claim as my invention and desire to secure by Letters Patentl. In an elevator safety attachment, the combination of: a lever, as F, to operate the valve of the prime motor, an operating device on the car, a connection between said lever and said operating device, an auxiliary motor, a knee-lever as J having one leg connected with the piston of said auxiliary motor and the other leg of the lever connected with said lever F, a balanced valve to admit the Water to either end of the cylinder of the auxiliary motor, an electromagnet to draw the valve in one direction and a spring to move it back, a circuit for an electric current to charge said electromagnet by closing the door of the elevator-well, substantially as described.

2. In an elevator safety attachment, the combination of: a lever, as F, to operate the valve of the prime motor, an operating dcvice on the car, a connection between said lcver and said operating device an auxiliary motor, a knee-lever as J having one leg connected with the piston of said auxiliary motor and the other leg of the lever connected with the said lever F, a balanced valve to admit the Water to either end of the cylinder of the auxiliary motor, an electromagnet to draw the valve in one direction and a spring to move it back, a circuit for an electric current to charge said electromagnet by closing IOO the door of the elevator-Well,a circuit-breaker connected with said circuit and attached to the car in position to be operated by the operating device substantially as described.

3. In an elevator safety attachment, the combination of: a lever, as F, to operate the valve of the prime motor7 an operating device on the car, a connection between said lever and said operating device an auxiliary motor, a knee-lever as J having one leg connected With the piston of said auxiliary niotor, and the other leg of the lever connected with the lever F, a balanced valve for said auxiliary motor an electromagnet to draw the valve in one direction and a spring to move it back, a circuit for an electric current to charge said electromagnet to be operated by closing the door of the elevator-well, a cord as a' attached at one end to said kneclever and the other end attached to the shutoil? valve in the supply-pipe of the prime motor, substantially as described.

In testimony whereof I have hereunto set my hand this 5th day of December, A.. D. 1890.

CHARLES Il. NEWI'IALL.

In presence of- HOWARD E. BARLOW, BENJ. ARNOLD.

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